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When they are:1) seeing someone else2) not interested3) having prostate trouble and needs to see a doctor... I know an 89 year old and he would love for me to get naked. He says all the plumbing works fine.

Sexual disfunction can strike any age or gender for a variety of reasons. For example, stress (at work, home, etc). Make sure you are understanding and do not put too much pressure on him to perform. That will make it worse and make him bitter at the same time. Be patient and kind. If all else fails, there are medications that can help.